Odd orthography

I've been surfing some rap or hip-hop (I'm not "hep" to the "lingo"
anymore!) Webpages and noticed an odd phenomenon, and I'm wondering
if there is a name for this or anything similar in other languages.

On most of these Websites, the plural "s" is consistently replaced
with a "z" (eg. "Boyz").  It's not just an attempt to reproduce
pronounciation, since they also do it when the sound is still "s"
(eg. "Linkz").  They also do a lot of strange things with titles of
songs, some of which almost read like a rebus, but I can't detect any
consistent pattern.

The only things I can think of that are similar are the way that we
used to write America as "Amerika" in the '70s to imply that the U.S
was a fascist state; and I once saw someone write "America(tm)" to
critique the overly capitalistic bent of American society.

Do any other languages announce political or lifestyle affiliation
merely by spelling changes?

-- Terry